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“当代美国英语语料库”(Corpus of Contemporary American English,COCA)由美国杨百翰大学(Brigham Young University)教授 Mark Davies 创建,收录了从1990年至今每年2,000万词的语料,总规模已超过5亿词。这些语料由口语、小说、杂志、报纸、学术性内容5个相等的部分组成,是目前最大的当代美国英语平衡语料库。本系列词汇书单词及词频来自COCA。 初级 3,000词,对应中学生的词汇量,适合准备高考的学生; 中级 4,000词,对应非英语专业大学生的词汇量,适合参加四六级考试、考研的学生; 中高级 4,000词,对应英语专业四级词汇量,适合参加SAT(美国高考)、托福、雅思、英语专业四级考试的学生; 高级 6,000词,对应英语专业八级词汇量,适合参加GRE、英语专业八级考试的学生。
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